Berkeley Lab – CS Seminar

Date:
Wednesday, December 11, 2024

Time:
9:00am - 10:00am

Location:
Zoom: https://ESnet.zoom.us/j/86163034464      

Speakers(s) and Affiliations(s):
Prof. Wolfgang Tittel, University of Geneva
Constructor Institute of Technology Schaffhausen and Constructor University Bremen

Title:
Quantum Network Technology – The Second Life of Rare-earth Crystals

Abstract:
Starting with the demonstration of lasing more than 50 years ago, the special properties of rare-earth ion doped crystals and glasses have given rise to the development of solid-state lasers and amplifiers, which are crucial for the functioning of today’s world-wide Internet. As a fascinating generalization of their use in optical communication infrastructure, it became clear during the past decade that, when cooled to cryogenic temperatures of a few Kelvin, rare-earth crystals also promise the creation of technology for quantum communication networks.

I will discuss recent advances towards the development of key ingredients of such networks: the creation of single photons using individual rare-earth ions coupled to nano-photonic cavities, as well as the reversible storage of quantum states of light in large ensembles of rare-earth ions. This work is not only interesting from a fundamental point of view, but furthermore paves the path towards a quantum repeater, which will ultimately enable quantum communications over arbitrary distances.

Bio:
Wolfgang Tittel received his PhD from the University of Geneva in 2000, joined the University of Calgary in 2006 as associate professor and industrial research Chair, and became full professor in 2013. In 2018 he accepted a position at QuTech at the Delft University of Technology and, since January 2023, he is a professor and Chair affiliated with the University of Geneva, the Constructor Institute of Technology in Schaffhausen, and the Constructor University in Bremen.

Dr. Tittel has engaged in groundbreaking research in quantum communication from the early stages on. His work stretches across atomic and optical physics and has raised appreciation that quantum communication is not restricted to controlled laboratory settings. His current research interests include the interaction between photons and rare-earth crystals—including for optical quantum memory, sources of quantum light as well as quantum information processing—, nano-photonics, quantum repeaters, and quantum networks.

Virtual Information:
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ESnet.zoom.us/j/86163034464

Meeting ID: 86163034464

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Meeting host: [email protected]

Host of Seminar:
Wenji Wu
Energy Sciences Network - ESnet
Lawrence Berkeley National Laboratory

Berkeley Lab – CS Seminar

Date:
Thursday, December 12, 2024

Time:
3:00pm - 4:00pm

Location:
Zoom: https://lbnl.zoom.us/j/93001359316?pwd=m7uUfMLevHgSMRGxUIbpIMlkxutPws.1

Speakers(s) and Affiliations(s):
Dr. Archana Kamal
Northwestern University

Title:
Non-QND and non-Markovian effects in cQED

Abstract:
Strong light-matter interactions form the backbone of quantum information platforms such as circuit-QED. While strong coupling is necessary for high-precision and fast information processing, it can pose theoretical as well as practical challenges in the understanding and control of such quantum systems in presence of noise and dissipation. First, I will discuss non-QND effects in dispersive cQED and how extension of simple Markovian quantum master equation (QME) have enabled a surprising resolution of the infamous T1 anomaly (a.k.a. demolition of T1 during readout) in these setups [1].  Next, I will discuss time-non-local or memory effects in cQED platforms and discuss some recent results obtained using a frequency-domain QME, that retains the full state history beyond typical non-Markovian descriptions using Redfield QME. I will then present our newly proposed spectral measure of non-Markovianity which can help characterize these effects without any tomographic state reconstruction and also alleviates some key misdiagnoses obtained with time-domain recurrence-based measures such as BLP non-Markovianity. I will conclude with a discussion of how such tools can enable new opportunities for deploying open systems as a powerful probe of complex many-body phases of matter.

Bio:
Archana Kamal directs the QUantum Engineering Science and Technology (QUEST) Group at Northwestern University, with a focus on both fundamental and applied aspects of quantum information processing. She completed her pre-doctorate education in India -- B.Sc. (Honors) in Physics from St. Stephen’s College, Delhi and Master’s in Physics from Indian Institute of Technology Delhi – before moving to Yale University where she received her M.Phil. and Ph.D. degrees in Physics in 2010 and 2013 respectively, followed by a postdoctoral stint at MIT.  She was an Associate Professor of Physics and Applied Physics at UMass Lowell, before moving to Northwestern University in 2024. Some of the current themes pursued by her group include scalable entanglement stabilization and autonomous error correction, quantum-limited amplification and readout, and applications of quantum information concepts to tackle questions in early Universe cosmology, condensed matter and thermodynamics. Her contributions to nonreciprocal quantum signal processing were recognized by MIT Technology Review with a TR35: Global Innovator Award in 2018. She is also the recipient of the 2021 AFOSR Young Investigator Award and 2021 NSF CAREER Award.

Virtual Information:
Join Zoom Meeting
https://lbnl.zoom.us/j/93001359316?pwd=m7uUfMLevHgSMRGxUIbpIMlkxutPws.1

Meeting ID: 930 0135 9316
Passcode: 245906

Host of Seminar:
Monica Hernandez
Advanced Quantum Testbed (AQT)
Lawrence Berkeley National Laboratory

Additional information:
Presented by the Advanced Quantum Testbed (AQT) at Berkeley Lab

Berkeley Lab – CS Seminar

Date:
Tuesday, December 17, 2024

Time:
9:00am - 10:00am

Location:
Zoom: https://lbnl.zoom.us/j/93843700590?pwd=GkozAjrSbibkdGBIC7LTo8MCeLRpEq.1     

Speakers(s) and Affiliations(s):
Earl Campbell
VP Quantum Science
Riverlane

Title:
Demonstrating real-time and low-latency quantum error correction: with FPGAs, ASICs, and demonstrated with superconducting qubits

Abstract:
Quantum error correction (QEC) will be essential to achieve the accuracy needed for quantum computers to realise their full potential. The field has seen promising progress with demonstrations of early QEC and real-time decoded experiments. As quantum computers advance towards demonstrating a universal fault-tolerant logical gate set, implementing scalable and low-latency real-time decoding will be crucial to prevent the backlog problem, avoiding an exponential slowdown and maintaining a fast logical clock rate.  In this talk, I review our work on FPGA and ASIC based decoders benchmarked on larger code distance (https://arxiv.org/abs/2309.05558),  and also report on recent results demonstrating the FGPA decoder in collaboration with Rigetti to perform a stability QEC experiment (https://arxiv.org/abs/2410.05202).   I will finish with a teaser of even more recent results on our next-generation hardware.

Bio:
Earl is a world expert in quantum error correction with nearly two decades of experience in creating fresh design concepts for fault-tolerant quantum computing architectures. During his career, Earl has made significant contributions to quantum error correction, fault-tolerant quantum logic and compilation, and quantum algorithms--with 80+ publications and authoring the premier review on quantum error correction in Nature.

Virtual Information:
Join Zoom Meeting
https://lbnl.zoom.us/j/93843700590?pwd=GkozAjrSbibkdGBIC7LTo8MCeLRpEq.1

Meeting ID: 938 4370 0590
Passcode: 171461

Host of Seminar:
Bert de Jong
Applied Computing for Scientific Discovery
Applied Mathematics and Computational Research Division
Lawrence Berkeley National Laboratory